Let A, B be two 2 x 2 matrices. Which of the following is true. (a) If A² = 0, then A = 0, where 0 is the 2 × 2 zero matrix. (b) If A² = A, then A = 0 or A = I2, where I2 is the 2 x 2 identity matrix. (c) AB = BA. (d) (A + B)(A − B) = A² − B² (e) None of the above is true. a b с d e

Algebra and Trigonometry (6th Edition)
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Author:Robert F. Blitzer
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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
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Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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Let A, B be two 2 × 2 matrices. Which of the following is true.
(a) If A² = 0, then A = 0, where 0 is the 2 × 2 zero matrix.
(b) If A² = A, then A = 0 or A = I2, where I2 is the 2 × 2 identity matrix.
(c) AB
BA.
(d) (A + B)(A − B) = A² − B² (e) None of the above is true.
a
=
b с
d
e
Transcribed Image Text:Let A, B be two 2 × 2 matrices. Which of the following is true. (a) If A² = 0, then A = 0, where 0 is the 2 × 2 zero matrix. (b) If A² = A, then A = 0 or A = I2, where I2 is the 2 × 2 identity matrix. (c) AB BA. (d) (A + B)(A − B) = A² − B² (e) None of the above is true. a = b с d e
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